Data Transmission Method, Terminal Device, and Network Device

1. A data transmission method, comprising: receiving a first downlink data packet sent by a network device, the first downlink data packet comprising a first reflective QoS indication RQI that is a first preset value; keeping, according to the first preset value, a mapping rule of a first mapping relationship and a mapping rule of a second mapping relationship to be both unchanged, and receiving an radio resource control RRC message sent by the network device, the first mapping relationship being a mapping relationship from internet protocol IP flows to quality of service QoS flows, the second mapping relationship being a mapping relationship from QoS flows to data radio bearers DRBs, and the RRC message comprising a target mapping rule; and determining, according to the RRC message, the mapping rule of the second mapping relationship, as the target mapping rule, wherein before receiving the first RQI sent by the network device, the method further comprises: receiving a second downlink data packet sent by the network device, the second downlink data packet comprising a second RQI that is a second preset value; activating, according to the second preset value, a first reflective QoS to update the first mapping relationship, and activating, according to the second preset value, a second reflective QoS to update the second mapping relationship, the updating the first mapping relationship comprising determining the first mapping relationship of the second downlink data packet as the first mapping relationship of a second uplink data packet, and the updating the second mapping relationship comprising determining the second mapping relationship of the second downlink data packet as the second mapping relationship of the second uplink data packet; and sending the second uplink data packet to the network device; wherein keeping, according to the first preset value, the mapping rule of the first mapping relationship and the mapping rule of the second mapping relationship to be both unchanged comprises: keeping an activation state of the first reflective QoS, and an activation state of the second reflective QoS.

2. The method according to claim 1 , wherein after determining, according to the RRC message, the mapping rule of the second mapping relationship, as the target mapping rule, the method further comprises determining the first mapping relationship of the first downlink data packet as the first mapping relationship of a first uplink data packet according to the first reflective QoS, and determining the second mapping relationship of the first uplink data packet according to the target mapping rule; and sending the first uplink data packet to the network device.

3. The method according to claim 1 , wherein the target mapping rule is consistent with an updated mapping rule of the second mapping relationship.

4. A data transmission method, comprising: sending a second downlink data packet to a terminal device, the second downlink data packet comprising a second reflective QoS indication RQI that is a second preset value, the second preset value being used to indicate the terminal device to activate a first reflective QoS to update a first mapping relationship, and activate a second reflective QoS to update a second mapping relationship, the first mapping relationship being a mapping relationship from interne protocol IP flows to quality of service QoS flows, the second mapping relationship being a mapping relationship from QoS flows to data radio bearers DRBs, the updating the first mapping relationship comprising determining the first mapping relationship of the second downlink data packet as the first mapping relationship of a second uplink data packet, and the updating the second mapping relationship comprising determining the second mapping relationship of the second downlink data packet as the second mapping relationship of the second uplink data packet; receiving the second uplink data packet sent by the terminal device; and sending a first downlink data packet and an radio resource control RRC message to the terminal device, after determining the first mapping relationship of the second uplink data packet is correct, the first downlink data packet comprising a first RQI that is a first preset value, the first preset value being used to indicate that the terminal device keeps an activation state of the first reflective QoS, the RRC message comprising a target mapping rule, and the target mapping rule being used to indicate the terminal device to determine the mapping rule of the second mapping relationship as the target mapping rules.

5. The method according to claim 4 , after sending the first downlink data packet and the radio resource control RRC message to the terminal device, the method further comprises: receiving the first uplink data packet sent by the terminal device, the first mapping relationship of the first uplink data packet being determined by the terminal device according to the first reflective QoS, and the second mapping relationship of the first uplink data packet being determined by the terminal device according to the target rule.

6. The method according to claim 4 , wherein the target mapping rule is consistent with an updated mapping rule of the second mapping relationship.

7. A network device, comprising a processor, a transceiver and a memory, wherein when instructions stored in the memory is executed by the processor, the execution causes the network device to perform the method according to claim 4 .

8. The network device according to claim 7 , wherein the transceiver is specifically configured to: receive the first uplink data packet sent by the terminal device, the first mapping relationship of the first uplink data packet being determined by the terminal device according to the first reflective QoS, and the second mapping relationship of the first uplink data packet being determined by the terminal device according to the target rule, after the first downlink data packet and the radio resource control RRC message are sent to the terminal device by a sending unit.

9. The network device according to claim 7 , wherein the target mapping rule is consistent with an updated mapping rule of the second mapping relationship.

10. A terminal device, comprising a processor, a transceiver and a memory, wherein when instructions stored in the memory is executed by the processor, the execution causes the terminal device to: receive, by the transceiver, a first downlink data packet sent by a network device, the first downlink data packet comprising a first reflective QoS indication RQI that is a first preset value; and keep, by the processor, according to the first preset value, a mapping rule of a first mapping relationship and a mapping rule of a second mapping relationship to be both unchanged, and receiving an radio resource control RRC message sent by the network device, the first mapping relationship being a mapping relationship from internet protocol IP flows to quality of service QoS flows, the second mapping relationship being a mapping relationship from QoS flows to data radio bearers DRBs, and the RRC message comprising a target mapping rule, determine, by the processor, according to the RRC message, the mapping rule of the second mapping relationship, as the target mapping rule, wherein the transceiver is specifically configured to: receive a second downlink data packet sent by the network device, the second downlink data packet comprising a second RQI that is a second preset value before receiving a first RQI sent by a network device; wherein the processor is specifically configured to: activate, according to the second preset value, a first reflective QoS to update the first mapping relationship, and activate, according to the second preset value, a second reflective QoS to update the second mapping relationship, the updating the first mapping relationship comprising determining the first mapping relationship of the second downlink data packet as the first mapping relationship of a second uplink data packet, and the updating the second mapping relationship comprising determining the second mapping relationship of the second downlink data packet as the second mapping relationship of the second uplink data packet; wherein the terminal device is further caused to: send, by the transceiver, the second uplink data packet to the network device; wherein the processor is specifically configured to: keep an activation state of the first reflective QoS, and an activation state of the second reflective QoS.

11. The terminal device according to claim 10 , wherein the processor is specifically configured to: determine the first mapping relationship of the first downlink data packet as the first mapping relationship of a first uplink data packet according to the first reflective QoS, and determine the second mapping relationship of the first uplink data packet according to the target mapping rule, after the mapping rule of the second mapping relationship is determined as the target mapping rule according to the RRC message; the transceiver is specifically configured to: send the first uplink data packet to the network device.

12. The terminal device according to claim 10 , wherein the target mapping rule is consistent with an updated mapping rule of the second mapping relationship.